If you have a volt meter you can check the resistance. If my memory is correct it should be under 1 ohm. I think the new ones I got tested at .3 ohm. If you dont have a meter take a test light. One end in the + side of the battery and the other end to the top of the glow plug. If good it should light up. Both of these tests should be done with the harness off the plugs. If you have a bad one you may as well do replace them all. And pray that the tip hasnt swelled/burst on you. Not fun. Im sure others will chime in but thats my experience as the not so proud owner of a 1992 idi truck.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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